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(WARNING)
RED MESSAGE (CAUTION)
AMBER MESSAGE (ADVISORY)
CYAN MESSAGE (STATUS)
WHITE MESSAGE Require immediate crew attention. These messages are accompanied by flashing master warning, triple chime attenson with or without voice message or dedicated tone. Require immediate crew awareness and future crew action may be required in the form of alternate system selection or performance limitation. These message are accompanied by flashing master caution and a single chime. Indicate safe or normal system operation which require crew awareness, over and above the dark cockpit philosophy. Indicate minor failures or reduction in systems capability, which require no crew action.

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02/02/21

Message Overview:

Message Name:

IASC1 RS422 DISABLE FAIL

Message Code:

B3-006903

Associated CAS:

None

Reporting LRU: IASC1 TST A
System Description: 21-31-00
Schematic Diagram: None
Wiring Diagram: 21-31-05

Message Description:

The discrete input AUTO PRESS 2 IN from the IASC-2 to the IASC-1 is detected failed.

Possible Causes:

  • Integrated Air System Controller (IASC-1) (A55)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Integrated Air System (IAS) Controller AMM 21-31-01-000-801
Installation of the Integrated Air System (IAS) Controller AMM 21-31-01-400-801
Operational Test of the Integrated Air System (IAS) Controller AMM 21-31-01-710-801
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Wire Repair SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Check the #1 IAS controller circuit breaker CB1 D14 & CB1 E10, reset and re-check MDC for the bus fault.
  2. Check the wiring from IASC #2 (A56P2 Pin 39) to IASC #1 (A55P2 pin 72), Auto Press 2 in discrete wiring.
  3. Suspect the #1 IAS controller, remove and replace Integrated Air System (IAS) Controller.
  4. Operational test of the Integrated Air System (IAS) Controller.

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